MD-MT831H/W SERVICE MANUAL No. SX963MDMT831H MD-MT831H(GL) MD-MT831W(GL) • In the interests of user-safety the set should be restored to its original condition and only parts identical to those specified be used. Illustration: MD-MT831H Illustration: MD-MT831W CONTENTS Page SAFETY PRECAUTION FOR SERVICE MANUAL ............................................................................................................... 2 SPECIFICATIONS ..................................................................
MD-MT831H/W SAFETY PRECAUTION FOR SERVICE MANUAL Precaution to be taken when replacing and servicing the Laser Pickup. The AEL (Accessible Emission Level) of Laser Power Output for this model is specified to be lower than Class I Requirements. However, the following precautions must be observed during servicing to protect your eyes against exposure to the laser beam.
TROUBLESHOOTING When the unit has condensation inside, the disc signals cannot be read, and the unit may not function properly. ● If this happens, remove the disc. The condensation should evaporate in approximately 1 hour. The unit will then function properly. CAUSE –6– ● Has the track number or character information been written on the disc yet? ● Is the unit in the recording or editing mode? The MiniDisc cannot be ejected.
( ● Replace the disc with a recorded disc. ● Record using the analogue cable. ● Change the stop position of the track and then try editing it. ● Record after you check the remaining recording time. ● Reload the disc or replace it. ● Replace it with another recorded disc. ● Re-record or replace it with another recordable disc. ● Check the number of tracks. ● Replace the disc with another recordable disc. ● If the sound you hear is not right, try recording again.
–8– Plug the remote control unit into the unit. Push the plug all the way in. button again. Press the • ■/:OFF button whilst in the stop mode. To turn off the power: Press the • ■/:OFF button. To stop playback: Press the button. ● To resume playback, press the To interrupt playback: 4 socket on the main Insert the earphones plug firmly into the earphones socket on the remote control unit. 3 Insert a MiniDisc.
MD-MT831H/W REMOVING AND REINSTALLING THE MAIN PARTS Remove the mechanism according to the disassembling methods 1 to 5. (See Page 10.) How to remove the spindle motor (See Fig. 11-1.) (A2)x3 ø1.4x2.8mm 1. Remove the solder joint (A1) x 4 of flexible PWB. 2. Remove the screws (A2) x 3 pcs., and remove the spindle motor. Spindle Motor MD Mechanism How to remove the lift motor (See Fig. 11-2.) 1. Remove the solder joint (B1) x 2 of Lift motor. 2. Remove the screw (B2) x 1 pc., and remove the lift motor.
MD-MT831H/W ADJUSTMENT Test disc MD adjustment needs two types of disc, namely recording disc (low reflection disc) and playback-only disc (high reflection disc). Type Test disc 1 High reflection disc MMD-110 (TEAC Test MD) 2 Low reflection disc MMD-213A (TEAC Test MD) 3 Low reflection disc Recording minidisc Parts No. 88GMMD-110 88GMMD-213A UDSKM0001AFZZ Note: Use the low reflection disc on which music has been recorded. Entering the TEST mode 1.
MD-MT831H/W Operation in each TEST mode 1. AUTO1 Mode • When the STOP button is pressed while the AUTO1 menu appears or during automatic adjustment, the mode changes to the TEST mode stop state. At this time the adjustment value is not output. • Be sure to adjust, using the specified disc MMD-212. At this time release the EEPROM (IC402) protection. (Refer to EEPROM write procedure.
MD-MT831H/W 6. TEST-REC Mode • When the STOP button is pressed while the TEST-REC menu appears, or in the TEST-REC mode or continuous record mode, the mode changes to the TEST mode stop state. • When the PLAY button is pressed while the TEST-REC menu appears, the continuous record is initiated from the current pickup position. • Whenever the DISP button is pressed in the TEST-REC menu, the target address changes as follows.
MD-MT831H/W EEPROM (IC402) writing procedure 1. Procedure to replace EEPROM and write initial value of microcomputer in EEPROM (1) (2) (3) (4) Replace EEPROM. Refer to the latest EEPROM data list. Start the test mode. (Refer to "How to enter the test mode".) Version display [Ver. ] EEPROM version (C ~ Z) Microcomputer ROM version (5) The whole LCD lights. (6) Test mode stop state. [ T E S T ] (7) Press the "BASS" button, and press twice the "SKIP DOWN" button.
MD-MT831H/W EEPROM DATA LIST (EEPROM version c) Fucus setting Item display Spindle setting Set values Item display Set values FG1_ FG2_ FF0_ FF1_ 20H 31H 10H 70H SPG_ SPi_ SPm_ SPo_ 14H 4AH 29H 1FH FF2_ Ff0_ Ff1_ Ff2_ E8H 10H 40H E8H PGM_ SP1_ SP2_ E0H 10H 60H FZH_ FLn_ FLp_ EDH 0AH 07H SP3_ SP4_ SP5_ Sp2_ F2H F2H 10H 60H DjG_ FSS_ FTS_ FSB_ 0DH 1CH 18H 30H Sp5_ SD1_ SD2_ SPK_ 10H 78H 7FH 6BH FTB_ FGM_ 28H 66H MPG_ 48H Sled setting Tracking setting Item display TG1_ Item display Set
MD-MT831H/W ADJ.
MD-MT831H/W Test Mode Change Chart Tset Mode Menu TEST : Test Mode STOP SKIP DOWN SKIP UP Slide external periphery move Slide internal periphery move BASS SKIP DOWN AUTO1 SKIP UP : Pre-auto adjustment menu SKIP DOWN AUTO2 SKIP UP T SKIP DOWN PLAY SKIP UP T : ATT auto adjustment menu SKIP DOWN REC SKIP UP : ATT manual adjustment menu SKIP DOWN MANU1 SKIP UP : Pre-adjustment value check menu SKIP DOWN MANU2 SKIP UP E : Pre-manual adjustment menu : ATT adjustment value check menu SKIP
MD-MT831H/W Preautomatic Adjustment AUTO1 : Preautomatic Adjustment menu PLAY AT1 : During preadjustment adjustment Adjustment error Normal end ADJ. NG ADJ. OK : Preadjustment error (adjustment value output) : Preadjustment normal end (adjustment value output) PLAY AT2 : During ATT automatic adjustment * When the [STOP] button is pressed in specific menu, the "TEST MODE STOP" state is set. *" " represent the adjustment number as follows.
MD-MT831H/W Pre-Manual Adjustment MANU1 : Pre-Manual Adjustment menu PLAY TMP SKIP UP $ $ SKIP DOWN : A signal offset (AINO) tentative measurement : Measurement value Ah SKIP UP SKIP DOWN : B signal offset (BINO) tentative measurement : Measurement value Bh SKIP UP SKIP DOWN : E signal offset (EINO) tentative measurement : Measurement value Eh SKIP UP SKIP DOWN Fh SKIP UP LON SKIP UP P : AB MAXO measurement : Measurement value SKIP DOWN : B-ATT (focus) tentative setting : ATT setting SKIP D
MD-MT831H/W ATT Manual Adjustment MANU2 : ATT manual adjustment menu PLAY TMP SKIP UP LON SKIP UP $ $ SKIP DOWN P : Pit section E-ATT (tracking) setting : ATT setting SKIP DOWN : Pit section F-ATT (tracking) setting : ATT setting PF SKIP UP SKIP DOWN : High reflection: A-ATT (focus) setting : Low reflection: A-ATT (focus) setting : ATT setting HA La SKIP UP SKIP DOWN : High reflection: B-ATT (focus) setting : Low reflection: B-ATT (focus) setting : ATT setting HB Lb SKIP UP SKIP DOWN GC SKIP
MD-MT831H/W Continuous Playback • Continuous playback from current pickup position T PLAY : Continuous playback menu PLAY SQ#### AP#### : Continuous playback (pit section) : Continuous playback (groove section) # # # # : Address • Continuous playback from any address T PLAY : Continuous playback menu DISP Ad 0 0 3 2 : Start address setting PLAY SQ#### AP#### : Continuous playback (pit section) : Continuous playback (groove section) # # # # : Address * When the [STOP] button is pressed in sp
MD-MT831H/W Continuous Rrecord • Continuous record from the current pickup position T REC : Continuous record menu PLAY : Continuous record # # # #: Address • Continuous record playback from any address AP# # # # T REC : Continuous record menu PLAY : Start address setting Ad 0 0 3 2 PLAY : Continuous record # # # #: Address AP# # # # * When the [STOP] button is pressed in specific menu, the "TEST MODE STOP" state is set.
MD-MT831H/W Test Mode Normal Playback NORMAL : TEST mode normal playback menu PLAY @@@@@@ : Continuous playback @@@@@@: Mode and address display * When the [STOP] button is pressed in specific menu, the "TEST MODE STOP" state is set. * When the NORMAL mode is canceled, the power is turned off.
MD-MT831H/W EEPROM Setting EEPROM : EEPROM setting menu PLAY SKIP DOWN TEMP SKIP UP SKIP DOWN Focus SKIP UP : Focus setting menu SKIP DOWN Track SKIP UP : Tracking setting menu SKIP DOWN Spin SKIP UP : Spin setting menu SKIP DOWN Sled SKIP UP : Sled setting menu SKIP DOWN Bass SKIP UP : BASS setting menu SKIP DOWN ADJSET SKIP UP : Adjustment setting menu SKIP DOWN DEQSET SKIP UP SKIP UP : TEMP setting menu : Digital EQ setting menu SKIP DOWN CTRL : Control setting menu * When the [S
MD-MT831H/W TEMP Setting Temp : Temp setting menu PLAY TM§§ SKIP UP SKIP DOWN T p i n : TEMP reference : Reference § § : Temperature code : TEMP A/D input value : Measurement value * When the [STOP] button is pressed in specific menu, the "TEST MODE STOP" state is set. * When the [DISP] button operation is performed in the specific state, the menu changes to "TEMP SETTING menu". * In the specific state the setting changes in the range of "00h to FFh" when the [VOL UP/DOWN] button is pressed.
– 27 – M Figure 27 BLOCK DIAGRAM M903 LIFT MOTOR M M902 SLED MOTOR M +2.5V +2.7V +B Q101 SWITCHING T M901 SPINDLE MOTOR F PICK OPIC LASER HEAD 21,25, 27,29 7,9, 12,14 Q101 1-2 28 +2.5V 29,40 IC101 RF SIGNAL PROCESSOR IR3R58M HEAD DRIVER IC351:74ACT02T IC353:FTD2005 IC354:CPH5608 37 46 +2.5V 40,42 45,47 57,58 +B 26-30, 32-37, 39-46 2-5, 7-11, 14-23 66 55 AVCC +2.5V 2 VDD +1.7V 62 73 74 31,87,98 22 8 2,5-7 83, 84 LCD 82 74 +2.7 +2.
MD-MT831H/W P28 P29 P30 R DCNF GND1 BIAS VCC1 EFMAGC SW 2-1 ADAGI and RF3 ADIP AGC RF2 EFMO PITG RF1 NIN PIN 1+2 1234 3+4 A DIFF ADAGC RF4 ADIPNF ADIPO REFI GND2 BPF REFO AOUT WBO BIAS FOK SENSE VCC2 ASW B OPICPW SW AIN MODE BIN T- DISC CIN DINT DISC SGAIN SGAIN TEMP DTEMP RFADD 2.
TP410 MD-MT831H/W P28 P29 P30 DADATA ADDATA DFCK BCLK LRCK ADPON DAPON OPTCNT DIN EMPH1 EFMO DADATA DCNT OPTCNT TEST0 TEST1 DILOCK VXI LDCNT1 VPO EMPH LDCNT2 X1I VDD1 DIN X1O DGND DOUT LRCK DGND PLLBVC TEMON DFCK BCLK TOTMON ADDATA LDCNT2 LDCNT1 39 RAA11 RAD0 DAPON RAD1 RAWEX FOK RARASX SENSE RAA9 COUT CIN DINT RAD3 MCCK RAD2 DINTX XRT SYD0 SYD1 SYD2 SYD3 SYD4 SYD5 SYD6 SYD7 SYWR SYRD SYRS VDD2 RACASX DGND DGND RSTX RAOEX SYSD0 RAA8 SYSD1 RAA7 SYSD2 RAA6
MD-MT831H/W VOLTAGE IC101 PIN NO. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 VOLTAGE 0.27V 0.27V 0.27V 0.27V 1.26V 1.26V 1.26V 1.26V 1.26V 1.26V 1.26V 1.26V 1.26V 1.26V 1.26V 1.26V 1.26V 1.26V 1.26V 1.26V 1.26V 1.26V 1.26V 0.27V 1.48V – – 2.50V 2.50V 1.55V – 1.26V 1.26V 0.23V 1.26V 1.26V 1.27V 1.27V 0.25V 2.50V 1.50V – 1.26V – 0.28V 1.26V 0.28V 0.27V PIN NO.
MD-MT831H/W A B C D E F G H • The numbers 1 to 18 are waveform numbers shown in page 35. 1 2 3 4 Figure 32 WIRING OF P.W.
MD-MT831H/W A TO MAIN PWB P32 4-H CN601 OPTICAL PICKUP UNIT(15) B SW901 DISC PROTECT(8-2) M903 LIFT MOTOR PH901 PHOTE INTERRUPTER (8-3) C CN101 TO MAIN PWB P32 2-H M902 SPINDLE MOTOR MECHANISM FLEXIBLE PWB Ass'y(8) D LCD Ass'y(235) M901 SLED MOTOR E TO MAIN PWB P32 4-B CN451 CN451 F MAGNETIC HEAD(21) KEY SWITCH FLEXIBLE PWB Ass'y(234) G H 1 2 3 4 Figure 34 WIRING OF P.W.
MD-MT831H/W WAVEFORMS OF MD CIRCUIT T Stopped CH1=1mV DC 10:1 1 CH2=500mV DC 10:1 CH3=5V DC 10:1 TP208 (FEOUT) 1994 / 12 / 15 22:54:19 CH4=2V 50ms/div DC 10:1 (50ms/div) NORM:200kS / s 1 2 TP122 (F+) 3 CK205 (SENSE) 4 CK204 (FOK) 2 3 T 4 =Filter= Smoothiing : OFF BW : FULL CH1 CH2 CH3 CH4 =Offset= : 0.00V : 0.000V : 0.00V : 0.00V =Record Length= Main : 10K Zoom : 10K T Stopped CH1=2V DC 10:1 =Trigger= Mode : NORMAL Type : EDGE CH4 Detay : 0.
MD-MT831H/W NOTES ON SCHEMATIC DIAGRAM • Resistor: To differentiate the units of resistors, such symbol as K and M are used: the symbol K means 1000 ohm and the symbol M means 1000 kohm and the resistor without any symbol is ohm-type resistor. Besides, the one with “Fusible” is a fuse type. • Capacitor: To indicate the unit of capacitor, a symbol P is used: this symbol P means micro-micro-farad and the unit of the capacitor without such a symbol is microfarad.
MD-MT831H/W TROUBLE SHOOTING It is advisable to use the TEST mode (refer to Error Data Display Mode, P14) indicating the causes of troubles before starting repair. Causes of operation errors (up to 10 errors) are recorded as error codes. This information is useful for repair. When does not function When the CD section does not operate When the objective lens of the optical pickup is dirty,this section may not operate.Clean the objective lens,and check the playback operation.
MD-MT831H/W • Abnormal display Is waveform output from CN451 pins 1 to 3? Are the pin10 (VCC) and pin 6 (GND) normal? Is waveform output from IC401 pins 9,11,13? No No Yes Check between IC401 and CN451. Check the periphery of IC401. Yes Check for pattern breakage of flexible PWB, check for defects of display microcomputer (replace the display unit). • Playback state cannot be set When it has been ascertained that the address up to cluster address is normal in the TEST mode.
MD-MT831H/W • The spindle motor fails to run.Does the head move Does the waveform appear on the IC201 pins 24 and 25 after TEST mode AUTO2 completion and in this state? No Check the IC201 periphery. Yes Does waveform appear on the IC601 pin 64? No Replace. IC601 Yes Does waveform appear on IC601 pins 25, 27 and 29? No L608, IC201, IC601, CN601 and flex, etc. soldering check Yes Replace the spindle motor.
MD-MT831H/W FUNCTION TABLE OF IC IC202 RH-iX2824AFZZ: 16 Bit D-RAM (IX2824AF) Function Terminal Name Pin No. 1 Vcc Power supply (2.6V) 2 DQ1 Data input/data output 3 DQ2 Data input/data output 4 WE Write enable 5 RAS Low address strobe 6 NC Not connected 7 A10 Address input 8-11 A0-A3 Address input 12 Vcc Power supply (2.
MD-MT831H/W IC401 RH-iX2823AF04 :System Microcomputer (IX2823AF) (1/2) Pin No.
MD-MT831H/W IC401 RH-iX2823AF04 :System Microcomputer (IX2823AF) (2/2) Pin No.
MD-MT831H/W IC601 VHiBD6603KV-1: Drive Servo/Motor Control (BD6603KV) (1/2) Function Terminal Name Pin No.
MD-MT831H/W IC601 VHiBD6603KV-1: Drive Servo/Motor Control (BD6603KV) (2/2) Function Terminal Name Pin No. 52* C1M 53* C1P CHARGEPUMP capacitor 1 connection termina l CHARGEPUMP capacitor 1 connection terminal + 54 EXTCLK Synchronous clock input terminal 55 STHB Half bridge mute terminal 56 STALL Stand-by terminal 57 VCC1 Small signal section power supply terminal 1 (MOS) 58 VCC2 Small signal section power supply terminal 2 (Bip.
MD-MT831H/W PARTS GUIDE MODEL MD-MT831H(GL) MD-MT831W(GL) “HOW TO ORDER REPLACEMENT PARTS” To have your order filled promptly and correctly, please furnish the following information. 1. MODEL NUMBER 2. REF. No. 3. PART NO. 4. DESCRIPTION For U.S.A. only Contact your nearest SHARP Parts Distributor to order. For location of SHARP Parts Distributor, Please call Toll-Free; 1-800-BE-SHARP MARK: SPARE PARTS-DELIVERY SECTION Explanation of capacitors/resistors parts codes Capacitors Resistors VCC .......
MD-MT831H/W NO. PRICE RANK PARTS CODE DESCRIPTION NO.
MD-MT831H/W NO.
MD-MT831H/W NO. PRICE RANK PARTS CODE J703 QJAKM0205AFZZ J J801 M901 M902 M903 SW401 SW402 SW403 SW901(8-2) QJAKC0146AFZZ RMOTV0529AFZZ RMOTV0530AFZZ RMOTV0531AFM1 QSW-M9015AFZZ QSW-S0948AFZZ QSW-M9016AFZZ ———— J J J J J J J DESCRIPTION NO.
MD-MT831H/W NO. ! PRICE RANK PARTS CODE TLABN1581AF01 J TLABN1582AF01 J TLABN1583AF02 J TLABS0478AFZZ J 1 2 2- 1 3 4 5 6 GCASZ0090AFSA RPHOH0176AFZZ PCAPH8107AFZZ UBNDT0086AFSA UBATI0088AFSA RRMCW0051AFSB SPAKZ0541AFZZ J J J J J J J 7 RADPA8487AFZZ J 8 9 10 QCNWG0382AFZZ J SPAKA2748AFZZ J TINSE1652AFZZ J 11 SPAKZ0475AFZZ J 12 13 14 UBAGC0083AFSA SPAKC6952AFZZ TLABN1580AF01 J J J 15 16 QCNWG0422AFZZ J TCADS0085AFZZ J 17 TINSE1654AFZZ J 18 TLABN1578AF02 J DESCRIPTION NO.
MD-MT831H/W 504 502 512 3 A 506 509 511 14 8 10 8-3 (PH901) 4 501 B 8-1 17 21 16 503 2 513x2 8-2(SW901) 12 1 C 503x2 508x3 510 15 507 M902 D 13 11 7 M901 9 6 E 505 M903 19 F 5 G 20 H 18 1 2 3 4 Figure 5 MD MECHANISM EXPLODED VIEW –5– 5 6
MD-MT831H/W 239 MD MECHANISM A 249 222 B 214 601x2 601x2 605 215 220 201 260 259 C 204 601x2 204 238 204 207 604 204 205 203 D 233 253 251 242 258 250 PWB-A2 241 206 239 229 217 226 221 227 225 E 232 224 213 212 240 263 211 212 223 PWB-A1 234 255 256 247 248 262 F 262 247 602 237 219 258 235 231 601x2 261 216 601 G 603 230 601x2 228 218 603 H 202 1 2 3 4 Figure 6 CABINET EXPLODED VIEW –6– 5 6
MD-MT831H/W PACKING METHOD (MD-MT831H FOR U.K. ONLY) Setting position of switches and knobs UNIT HOLD OFF Remote Control HOLD CANCEL 5 8 1 2 4 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. Battery Case Headphones handstrap Rechargeable Battery Remote Control AC Adapter Pad AC Adapter Connecting Cord, RCA Type Packing Add., Accessories Operation Manual Operation Manual Spacer Carrying Case Packing Case Serial No.
